The eastern states bid to win Perth's richest races fell apart on Saturday with the locals triumphant in both Group One races.

The Jim Taylor-trained Magnifisio took out the Winterbottom Stakes (1200m) while Elite Belle, from the Grant Williams stable claimed the Railway (1600m).

The best of the visitors was the Chris Waller-trained Moriarty who ran third in the Railway to earn favouritism for the Kingston Town in two weeks, Australia's final Group One race of the year.

Taylor said he believed Magnifisio could be competitive in sprint races in the east.

"She's probably good enough to go over east and have a crack over there," Taylor told Sky's Racing Retro.

"She proved yesterday she's up with the good Group One horses so she could make over there."

Fellow Perth trainer Neville Parnham is also planning a trip east with Group Two WA Guineas winner Rommel who stopped the unbeaten record of Disposition.

Parnham's 2010 WA Guineas winner Playing God finished third in the 2011 Australian Guineas won by Shamrocker and was again third in the Australian Cup behind Shocking.

He said Rommel might not be in the same class as Playing God but he and the Williams-trained Disposition would be competitive against their own age group.

"I think they'd be competitive in a race like the Australian Guineas, Parnham said.

"That's a good level for them.

"Next year the Randwick Guineas is run on the same day and one of them is probably going to be weakened off a fraction.

"But in saying that there is a top group of three-year-olds on the east coast.

"I took Playing God over there and he ran third, and probably an unlucky third, behind Shamrocker that year and then he came out and ran third in the Australian Cup.

"This horse probably hasn't quite shown his brilliance, but he's still a work in progress."

Both Guineas races are on March 7.